Improved beidge-guaeb oe baeeiee



JOHN LEHMANN, OF CROWN POINT, INDIANA.

tam Patent No. 81,383, daad August 25, .1868.

IMPROVBD BRIDGE-GUARD 0R BARRIER.

@its rtehule referat tu tu tipe ettt @that mit netting part at tte tame.

'ro A'LL WHQM IT MAY CDNCERN:

Be it known that I, JOHN LEHMANN, of Crown Point, in the county of Lake, and State of Indiana, have nvcnted certain new and useful Improvements in Bridge-Barrier g and I do hereby declare that the following .is a full, clear, and exact description thereof, reference being'had to the accompanying drawings, making part of this specification, and to the letters of reference marked thereon, 'like letters indicating like parts wherever they occur.

i To enable others skilled in the art to construct and use my invention, Lwill proceed to describe it.

In the accompanying drawi'ng.

Figure 1 is ail-elevation 'of the device from the river, when the bridge is open.

Figure 2 is the plan of thesame. i

Figure 3 is a' plan of segment A, and y Figure Ahis' the plan of machinery and ,of the bridge. The nature of my invention consists in the combination of racks,ratchet-wheels, anda pawl, so arranged, that, with the opening of a draw-bridge, a barrier is raised up to guard people from accidents.

Cog-segment A is secured torthe bottom of the bridge, near its edge, and acts upon the rateliets B B as the bridge M opens or closes. Pinions- C C are firmly set on the same shafts, b b, with ratchets B B, and their cogs gear into'vertical racks D D, which support and move barrier E,and are suitably enclosed and kept in position by plates F Gr. Plate I-I is secured to the bottom of and in the middle ofthe barrier, and tothe racks, to keep` the barrier always in .proper position while it is rising or lowering. On one of the shafts b is set ratchetwheel. K, to catch pawlL, made suiliciently heavy for the purpose, orretaned in place by spring Z, and connected with slotted bar N, to which chain O is secured. `Catch-levers P P are pivoted to the partition Q, which, with other partition, R, constitutes the siippo'rts to which shafts of the machinery are 'journalled The pimp, of the catch-lever P, sets in the slot n oi' bar N, and acts on therpawl L, while the lower end of the catch-lever P is secured to the chain O, passed around pulley S, and acts on the pawl L also, but at'the same time its lower end is connected by chain to spring T, which has the purpose to keep chain O always straightened, and hence to keepleverP in its position. y Spring T may be replaced by rope and weight. The tops of the catch-levers P P iit into notches a alot' the cog-segment A, and are pressed, one or the other, as the bridge opens or closes, thus disengaging p awl L from ratchet-wheel K, and allowing pinions C O to act on racks D, and raise or lower the barrier E. I

What I claim as my invention, and desire to secure by L etters Patent, is-- The combination of cog-segment A, ratehets B B, pinions C C, racks D D, pawl`L, and catch-levers P P', all arranged and operating substantially as herein set forth, for the purpose of operating a bridge-barrier. I

JOHN LEHMANN i Witnesses:

J. B; TURCHIN, N. K. Knosun. 

